Grooving-knife.



B. L. AB BO'I'T. enoovme' KNIFE.

APPLICATION IILBD U113 15. 1810.

989,541 Patented Apr. 11,1911.

BURL L. ABBOTT, OF WICHITA, KANSAS.

GROOVING-KNIFE.

Specification of Letters Patent. Patented Apr, 11, 1911, Application filed June 15, 1910.

Serial No. 567,078.

To all whom it may concern:

Be it known that I, BURL L. ABBOTT, a citizen of the United States, residing at Wichita, in the county of Sed'gwick and State of Kansas, have invented certain new and useful Improvements in Grooving- Knives, of which the following is a specification.

This invention relates to wood working machines and particularly to an improved construction of grooving knife used thereon.

The common practice is to buy the blanks from the manufacturers and make the knives by hand in the mill. This requires a great deal of time and labor in forming these tools, besides the expense of the delay.

One object of this invention is to improve the construction of the tool and obviate the necessity of the users making their own tools, by supplying a complete tool ready for use.

Another object is to provide a grooving knife which is of stronger construction than those in ordinary use.

With these and other objects in view the invention consists in the construction, combination and arrangement of the parts as will hereinafter be more fully described and particularly pointed out in the claims, but it will be understood that changes in the specific construction shown may be made within the scope of the claims without departing from the spirit of the invention.

In the drawings: Figure 1 is a top plan view of the improved grooving knife or tool, Fig. 2, is a side elevation of the same. Fig. 3, is a cross section on the line 33 of Fig. 2, Fig. 4, is a front elevation of the blank of the ordinary grooving knife, dotted lines showing the knife, Fig. 6 is an edge view of the blank, Fig. 5, is a front view of the ordinary knife cut from the blank shown in Fig. 4, and Fig. 7, is a front view of the cutter.

Referring to the drawings, and particularly to Figs. 4, 5 and 6, in which is shown the ordinary grooving knife and the blank from which it is cut, it will be seen that it is adapted to be cut from a rectangular plate 1, having one end bifurcated and forming an open ended slot 2, between the furcations 3, which fiircations are adapted to straddle the bolt on a cutter head. (Not shown.) In the mills where these grooving tools are used, the blanks shown in Fig. 4:,

are bought in quantities from the manufacturers, and the cutter is made from the blank on the dotted lines shown in Fig. 4:. This requires a great deal of time and labor, necessitating the owners having a special workman in the mill to do this work.

Now, by my construction I provide a ready made tool of great strength and durability, and as represented in Figs. 1 and 2, is formed of a single rectangular strip of steel 4, bent into the form of a U, and having the arms 5 and 6. The opening or slot 5 takes the place of the slot 2 in the ordinary form, and straddles the cutter head bolt. The arm 6 extends beyond the arm 5 and has formed on the end thereof, the cutting edge 8. Of course it will be understood that the upper portion of the extension 7 is highly tempered, and the rest of the tool is left untempered, to provide a strong cutting edge, and prevent breakage or bending.

The extension 7 is of slightly less cross section, than the other portion of the arm and is formed with the downwardly projecting portion 9, for greater strength, and making the extension deeper than the rest of the arm.

The juncture of the arm 6, with the extension 7, on the line AD, is parallel with, or on the same angle of inclination as the edge on the line BC, so as to gain the proper amount of clearance for the lower, or the cutting end of the blade, as the same becomes shorter by sharpening. Upon inspection of Fig. 2, it will readily be seen that between the points A and B is approximately the same distance as between C and D.

As best seen in Fig. 1, the upper face of the extension 7, tapers very gradually from A to B, and as seen in Fig. 7, the extension tapers from B to C. This is to give the proper clearance for the knife to leave the groove being cut.

From the foregoing, it will readily be seen, that I have provided a simple and inexpensive grooving tool which can be manufactured and sold to the wood-workers at a cost much less than the ordinary.

These tools can be bought from the manufacturers in quantities, and only need resharpening.

lVhat is claimed is:

1. A grooving tool formed of a single rectangular strip of metal bent into U form, one of the arms of which extends beyond the other arm, and forms the cutting edge, said extending arm being less in cross-section than the remainder of the arm.

2. A grooving tool formed of a single blank strip of rectangular metal bent into U form, and having one arm of the U longer than the other arm, and reduced, said arm being tempered and beveled to providea cutting edge, the space between the said arms forming an open ended slot by means of which the tool is adapted to straddle the bolt of a cutter head and be clamped thereto.

3. A grooving tool formed of a single blank strip of rectangular metal bent into U form and having one arm of the U longer than the other arm and reduced, said arm being tempered and beveled to provide a cutting edge, said longer reduced arm, having a downwardly projecting portion, and having its line of juncture with the larger l portion of the arm parallel with the said beveled edge.

4:. A grooving tool formed of a single blank strip of rectangular metal bent into U form, and having one arm of the U longer than the other arm and reduced to form a knife, said arm being tempered and beveled to provide a cutting edge, said longer reduced arm having .a downwardly projecting portion to form the back of said knife, and having its line of juncture with the larger portion of the arm parallel with said beveled edge, said reduced portion of the extended arm being greater in width at its cutting edge than at said juncture, and greater adjacent the cutting edge than at said back.

In testimony whereof I affix my signature, in presence of two witnesses.

BURL L. ABBOTT. WVitnesses 7. P. ABBOTT, FRANK S. ROSE.

Copies of this patent may be obtained for five cents each, addressing the Commissioner of Patents. Washington, D. 0. 

